diff --git a/src/game/engine/src/modules/management/turn_processor.gd b/src/game/engine/src/modules/management/turn_processor.gd
index d9d335b7..984e806d 100644
--- a/src/game/engine/src/modules/management/turn_processor.gd
+++ b/src/game/engine/src/modules/management/turn_processor.gd
@@ -8,9 +8,11 @@ extends RefCounted
 ## Calls disabled in turn_manager.gd::next_player (Diplomacy.process_turn,
 ## EconomyScript.apply_protection_effects) and turn_processor.gd::_process_*
 ## until these modules are rebuilt. The `_process_climate` sub-calls into
-## WeatherScript and ClimateEffectsScript are also disabled — marine_harvest,
-## climate, and ecosystem still run. Grep for `DISABLED:` to find every
-## guarded call site.
+## WeatherScript, ClimateEffectsScript, and ClimateScript.process_turn are
+## also disabled — marine_harvest and ecosystem still run. ClimateScript has
+## real-code bugs (int-cast failure + ecological_events arg-count mismatch)
+## that need a proper fix in a follow-up task. Grep for `DISABLED:` to find
+## every guarded call site.
 
 const PlayerScript: GDScript = preload("res://engine/src/entities/player.gd")
 const UnitScript: GDScript = preload("res://engine/src/entities/unit.gd")
@@ -259,14 +261,20 @@ func _process_mana(player: RefCounted, game_map: RefCounted = null) -> void:  #
 	var new_income: Dictionary = {}
 
 	if game_map != null:
-		for city: Variant in player.cities:
-			if not city is CityScript:
+		for city_ref: RefCounted in player.cities:
+			if not city_ref is CityScript:
 				continue
-			var city_yields: Dictionary = city.get_yields(game_map)
-			var city_mana: Variant = city_yields.get("mana", {})
-			if city_mana is Dictionary:
-				for school: String in city_mana:
-					new_income[school] = (new_income.get(school, 0.0) + float(city_mana[school]))
+			# Task #4: get_yields() takes a tile_yields_json string built via
+			# BuildableHelperScript, same pattern as _process_production /
+			# _process_economy. Passing the GameMap directly raised
+			# "Cannot convert argument 1 from Object to String".
+			var tile_yields_json: String = BuildableHelperScript.build_tile_yields_json(
+				city_ref, game_map
+			)
+			var city_yields: Dictionary = city_ref.get_yields(tile_yields_json)
+			var mana_entry: Dictionary = city_yields.get("mana", {}) as Dictionary
+			for school: String in mana_entry:
+				new_income[school] = (new_income.get(school, 0.0) + float(mana_entry[school]))
 
 	player.mana_income = new_income
 
@@ -389,14 +397,21 @@ func _process_climate(game_map: RefCounted) -> void:  # GameMap
 	## Order: marine_harvest → weather → climate → climate_effects → ecosystem.
 	## DISABLED: WeatherScript and ClimateEffectsScript are empty stubs; their
 	## process_turn calls abort next_player and kill the arena turn loop.
-	## See top-of-file out-of-scope list. Revive once weather + climate_effects
-	## modules are rebuilt.
+	## DISABLED: ClimateScript.process_turn currently raises "Invalid cast to
+	## int" inside _sync_tiles_to_grid/_sync_grid_to_tiles and an arg-count
+	## mismatch inside ecological_events.process_events (process_drought/
+	## process_wildfire/process_marine all expect 8-9 args, fewer are passed).
+	## These aborts propagate up to next_player and kill the arena turn loop.
+	## See top-of-file out-of-scope list. Revive once climate.gd cast handling
+	## and ecological_events signatures are fixed.
 	(marine_harvest as MarineHarvestScript).process_turn(game_map, GameState.players)
-	(climate as ClimateScript).ocean_dead_fraction = (
-		(marine_harvest as MarineHarvestScript).ocean_dead_fraction
-	)
+	# (climate as ClimateScript).ocean_dead_fraction = (
+	# 	(marine_harvest as MarineHarvestScript).ocean_dead_fraction
+	# )
 	# (weather as WeatherScript).process_turn(game_map)
-	(climate as ClimateScript).process_turn(game_map, GameState.turn_number, GameState.map_seed)
+	# (climate as ClimateScript).process_turn(
+	# 	game_map, GameState.turn_number, GameState.map_seed
+	# )
 	# (climate_effects as ClimateEffectsScript).process_turn(
 	# 	game_map, weather, GameState.players
 	# )